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Languages & runtimes · #prolog
Learn how to diagnose and fix stack overflow errors in Prolog caused by left-recursion using tracing, clause reordering, and right-recursive transformations.
Definite Clause Grammars (DCGs) let you write declarative parsers in Prolog, but left‑recursion and complex semantic actions can hurt performance. Learn how to design clean DCGs, avoid pitfalls, use tabling, and integrate with modern Prolog tools.
Learn how to use the Prolog cut operator (!) to prune search trees, optimize performance, and implement conditional logic while distinguishing between green and red cuts.
CLP(FD) in SWI-Prolog lets you state scheduling and puzzle constraints declaratively and let the solver search. A complete SEND+MORE=MONEY example, verification tips, and honest trade-offs.
Learn how to diagnose and fix linear search performance issues in Prolog by identifying missing or unsupported indexing on predicates.
Dynamic Predicate Recovery In ISO Prolog, managing the state of a dynamic database involves exporting current facts as Prolog terms and subsequently re-inserting them using assert/1 . This process is essential for maintaining state across sessions or recovering from runtime changes. Ordering Constraints While retract/1 and assert/1 allow for the modification
Pruning Backtracking in Logic Programming In Prolog, the cut operator ( ! ) is used to prune the search space by preventing the engine from backtracking to previous choice points. While red cuts are often employed to implement if-then-else logic, they fundamentally alter the declarative meaning of a program and can prevent predicates from being used in multi
The goal is to establish a clear, repeatable rule for whether a Prolog module that imports predicates from another module and then uses an unqualified export/1 clause should implicitly make those imported predicates available to downstream modules. Current implementations diverge: SWI‑Prolog treats export(_) as a blanket re‑export of all imported predicates,
Goal: determine whether the cut operator (!/0) should affect already‑tabled answers when evaluating a tabled predicate that contains a cut in one of its clauses. Uncertainty: XSB treats the cut as a local commitment that does not invalidate existing table entries, whereas Yap and SWI‑Prolog (with library(tabling)) may propagate the cut to prune the table, le